The growth of mobile and everything-as-a-service is making continuous delivery a necessity, not an option. Mobile drives continuous delivery adoption because of user expectations of frequent updates and because the app store model puts you in an uncomfortable position - and one you can't extract yourself from quickly - if you ship something that isn't working well. Behind almost every mobile app are hosted services, connecting to your existing systems and to third-party service providers. To be competitive and to take advantage of the mechanics and economics of delivering as-a-service, you want to roll out functionality quickly, experiment cheaply and gather real-time metrics about how your service is being consumed. Continuous delivery -- keeping your software in a release-ready state at all times, and rolling out new releases as often as makes sense for you -- is the way to solve these problems.